Westminster Transmission

Ford E40D/4R100

The E4OD/4R100 is one of Fords first and longest used 4 speed automatics,  used originally in everything from inline 6 cylinders to the powerstroke diesel in F550 pickups.   With the high popularity of the 7.3L Powerstoke diesel, a wide range of upgrades from the aftermarket has become available to match the raw power, some of these trucks can put out.  We offer three levels to suit your needs depending how mild or wild you wanna go, and we can customize these to fit your needs.

Level 1 (stock) includes:

  • Box overhaul kit including:
    • New clutches/Band
    • New seals/ sealing rings
    • New gaskets
    • XHD Sprag for second gear
    • New filter
  • 1 piece case bushing        
  • Rebuilt valve body
    • With new electric sensors and solenoids
  •  Stock depth Pan
  • Steel 3 pinion overdrive planetary set
  • Steel front planetary
  • Transgo shift improver kit
  • Rebuilt Torque Converter

Level 2 (Performance Rebuilt) includes:

  • Box overhaul kit including:
    • New clutches
      • Upgraded clutch pack for overdrive increasing clutch capacity 33.3%
      • Pateneted Zpack clutch pack for 2nd gear to prevent coning and decrease thermal load
    • New seals/ sealing rings
    • XHD Sprag for second gear
    • New band for manual 2nd
    • New gaskets
    • New filter
  • Steel overdrive 4 pinion planetary
  • Steel front 6 pinion planetary
  • Steel rear 6 pinion planetary
  • Performance Pump for optimum lube flow
  • Rebuilt valve body
    • With new electric sensors and solenoids
    • Transgo Tugger kit
  • Mag-Hytec deep cast pan (including manufactures lifetime warranty)
  • Billet faced, Single Disc Torque Converter

Level 3 (Ultimate Rebuilt) includes:

  • Box overhaul kit including:
    • New clutches
      • Upgraded clutch pack for overdrive increasing clutch capacity 33.3%
      • Pateneted Zpack clutch pack for 2nd gear to prevent coning and decrease thermal load
    • New seals/ sealing rings
    • XHD Sprag for second gear
    • New band for manual 2nd
    • New gaskets
    • New filter
  • Steel overdrive 4 pinion planetary
  • Steel front 6 pinion planetary
  • Steel rear 6 pinion planetary
  • Performance Pump for optimum lube flow
  • New 300M intermediate shaft
  • New 300M input shaft
  • New 300M output shaft
  • Rebuilt valve body
    • With new electric sensors and solenoids
    • Transgo Tugger kit
  • Mag-Hytec deep cast pan (including manufactures lifetime warranty)
  • Billet faced, Triple Disc Torque Converter
Same transmission used behind Brandon Zess's
lightning powered dune crushing super crew.


Call for a brochure or speak to us about what we can do for your needs (714) 898-0089
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